The A20210 allele of the prothrombin gene is not frequently associated with the factor V Arg 506 to Gln mutation in thrombophilic families - Alhenc-Gelas, M; Le Camp-Duchez, V; Emmerich, J; Frebourg, T; Fiessinger, JN; Borg, JY; Aiach, M (Blood, 1997)